[ntp:questions] Large and apparently permanent step in PPM error - confused?

David J Taylor david-taylor at blueyonder.neither-this-part.nor-this-bit.co.uk
Sat Nov 1 21:23:19 UTC 2008


David J Taylor wrote:
[]
> Crystals can sometimes jump in frequency, although I'm surprised to
> see a modern unit do so, and that is quite a large step.  How old is
> the system?
> David

Also - it could be that a capacitor in the oscillator circuit has either 
become open circuit, or has become disconnected.  As long as the 
oscillator restarts consistently, I would not worry about that.  I /might/ 
be a little more concerned about crystal frequency steps.

Cheers,
David 




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